MAC TOOLS MW 185 Plus, Owner'S Manual

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OM-230 852 Page 38
9-17. Troubleshooting Guide For Semiautomatic Welding Equipment
Problem Probable Cause Remedy
Wire feed motor operates, but
wire does not feed. Too little pressure on wire feed rolls. Increase pressure setting on wire feed rolls.
wire does not feed.
Incorrect wire feed rolls. Check size stamped on wire feed rolls, replace to match
wire size and type if necessary.
Wire spool brake pressure too high. Decrease brake pressure on wire spool.
Restriction in the gun and/or assembly. Check and replace cable, gun, and contact tip if
damaged. Check size of contact tip and cable liner,
replace if necessary.
Wire curling up in front of the
wire feed rolls (bird nesting). Too much pressure on wire feed rolls. Decrease pressure setting on wire feed rolls.
wire feed rolls (bird nesting).
Incorrect cable liner or gun contact tip size. Check size of contact tip and check cable liner length
and diameter, replace if necessary.
Gun end not inserted into drive housing properly. Loosen gun securing bolt in drive housing and push gun
end into housing just enough so it does not touch wire
feed rolls.
Dirty or damaged (kinked) liner. Replace liner.
Wire feeds, but no gas flows. Gas cylinder empty. Replace empty gas cylinder.
Gas nozzle plugged. Clean or replace gas nozzle.
Gas cylinder valve not open or flowmeter not adjusted. Open gas valve at cylinder and adjust flow rate.
Restriction in gas line. Check gas hose between flowmeter and wire feeder, and
gas hose in gun and cable assembly.
Loose or broken wires to gas solenoid. Have Factory Authorized Service Agent repair wiring.
Gas solenoid valve not operating. Have Factory Authorized Service Agent replace gas
solenoid valve.
Incorrect primary voltage connected to welding power
source. Check primary voltage and relink welding power source
for correct voltage.
Welding arc not stable. Wire slipping in drive rolls. Adjust pressure setting on wire feed rolls. Replace worn
drive rolls if necessary.
Wrong size gun liner or contact tip. Match liner and contact tip to wire size and type.
Incorrect voltage setting for selected wire feed speed on
welding power source. Readjust welding parameters.
Loose connections at the gun weld cable or work cable. Check and tighten all connections.
Gun in poor shape or loose connection inside gun. Repair or replace gun as necessary.